Combined drill and reamer.



PATENTED NOV; 24, 1 903. J.E.FUHRER. COMBINED DRILL AND REAMBR.

APPLIU TION FILED MAR. 3 19 R m M WIT/VESSEtS;

By Mg A fro/m5 rs.

m STATE Patented November 24, 1903.

ATlENT @rnibn.

COMBlNED DRILL AND REAIWER.

SPECIFICATION forming part of Letters Patent No. 745,048, dated November 24, 1903. Application filed March 3, 1903. Serial No. 145,912. (No model.) I

To all whom it may concern:

Be it known that I, J OHN EARL FUHRER, a citizen of the United States, and a resident of Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and Improved Combined Drill and Reamer, of which the following is a full, clear, and exact description.

The object of this invention is to provide novel means for adjustably holding a drill and an improved countersinking reamer device in one chuck for successive use.

The invention consists in the novel construction and combination of parts, as is hereinafter described, and defined in the appended claims.

Referenceis to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a perspective View of the improvement. Fig. 2 is a partly-sectional end View of the device substantially on the line 2 2 in Fig. 3. Fig. 3 is a longitudinal sectional view substantially on the line 3 3 in Fig. 2. Fig. 4 is a transverse sectional view substantially on the line a 4 in Fig. 3, and Fig. 5 is a perspective view of one of a pair of reamerblades employed.

The chuck that serves to hold a drill and the improved countersinking-reamer in relative positions for service comprises the following details: A cylindrical chuck block 6, axially perforated at a and threaded in said perforation, receives the exteriorlythreaded abutment-plug 7, which may be rotated for its longitudinal adjustment in the threaded bore of the chuck-block by the use of a suitable tool (not shown) that may have engagement with a transverse kerf b, formed in one end of the plug, as shown in Fig. 3. The chuck-block 6 at the end in which the plug 7 is inserted is considerably reduced in diameter and is threaded on said reduced end portion or nipple, thus being adapted for the screwed engagement therewith of the socket-nut 6, formed on one end of the driver-shank 6 that affords means for holding the entire device in a suitable machine for its rotary movement.

At the opposite end of the ob LlOk-blOCk 6 a coniform head 6 is integrally formed, and said head is transversely slotted across its axis from the outer end longitudinally a suitable distance to afiord a channel or slot each side of the center bore a of the chuckblock, which at this end thereof is not threaded. In the end of the abutment-plug 7 opposite that having the kerf b a coniform cavity is centrally formed, wherein the coniform end of a twist drill 8 is seated, the body of the drill extending centrally between the longitudinal channels before mentioned, and, as usual, the twist-drill is essentially cylindrical, having two spaced spiral grooves 61 formed therein, which extend from near the inner end of the drill-body to the outer end thereof, terminating in the cutting-lips d.

Two similar reamer-blades 9 form essential features of the invention, and each consists of a fiat steel plate of proper thickness to fit loosely in a respective channel formed to receive it in the coniform head 6 of the chuckblock 6. As shown in Figs. 3 and 5, the reamer-blades each have one straight edge e, that is concaved to adapt said edge to fit upon the body of the drill 8, and from the grooved edge of each reamer-blade a rib 6 projects longitudinally and diagonally across it, these ribs having the same spiral twist as that of the grooves cZ, so that the ribs will loosely fit in said grooves when the blades are properly located in the slots provided for their accommodation in the coniform head of the chuck block 6.

The end of each reainer-blade 9 that may abut against a transverse wall g, which defines the length of the channel occupied bya respective blade, is of such width that when the reamer-blades are .in contact with. the walls g the outer side edges h of the mannerblades that taper similarly to the taper of the coniform head 6 will project slightly outside of the tapering head, as is indicated by full and dotted lines in Fig. 3. The reamcrblades 9 have such length as will adapt them to project somewhat in advance of the end of the head 6, and the side edges lb of these projecting portions, that are extensions of the sloped edges h, have a steeper inclination, which preferably disposes them, respectively, at an angle of forty-five degrees with regard to the axis of the drill-body 8. Each side edge It is beveled transversely to produce an effective cutting edge thereon, which edges cut in the same direction as do the lips d on the drill 8. The cutting-edges h are so disposed that their lower ends bed in the grooves d, whereby these cutting edges will cleanly remove all the material around the edge of the hole drilled by the drill 8 and afford a smooth countersunk formation for the accommodation of the head of a screw or the like. In each blade 9 near the wide end and sloped edge It a transverse perforation h is formed, said perforation being angular, so that they each cut through a respective edge It.

In the tapered wall of the chuck-head 6 a circumferential groove is formed which is nearly semicircular, and in said groove is bedded a spring 10, having its ends bent into hook form, as shown at t' in Fig. 4, these hooks having engagement Within the angular perforations formed in the reamer-blades 9, and it will be seen that the resilience of the curved spring 10 will retain the blades 9 in place within the channels formed for their reception in the chuck-head 6. The chuckblock 6 is externally threaded throughout its cylindrical surface, and upon this portion of said chuck block the cylindrical part of a keeper-sleeve 11 is mounted, said sleeve beinginternally threaded for a portion of its' length that is cylindrical to permit it to be loosely screwed on the chuck-block. The u'nthreaded integral forward portion 11 of thekeeper-sleeve 11 is rendered coniform and is so proportioned that the inner surface of the coniform portion will be adapted to press upon the sloped outer edges of the reamerblades 9 when the sleeve is fully screwed upon the threaded body of the chuckblock 6, and thus hold the reamer-blades in enforced contact with the body of the drill 8, supporting said drill in a central position within the chuck-block.

It will be seen that as the ribs 6 are bedded in the spiral grooves 61 the drill-body will be held from rotating in the chuck-block if said drill is prevented from moving longitudinally therein, and to this end the plug 7 may be adjusted to bear upon the inner end of the drill, so that the drill and the reamer-blades will be held to rotate with the chuck-block.

As the release of the plug7 will permit the drill 8 to be moved into the chuck-block and be secured at a desired point therein by the plug 7, it will be evident that a hole or any.

number of holes of a predetermined depth may be formed in material and each hole countersunk before the removal of the drill therefrom.

As the sleeve 11 may be readily removed and convenient access be thus afforded to the reamer-blades 9 for their removal from the chuck-block, said blades may at any time be sharpened and replaced for renewed service.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent- 1. In a device of the character described, a chuck block having an axial bore and a slotted end, an abutment-plug adjustable in said bore, a twist-drill slidable in said bore and seated on the plug, reamer-blades held to rotate in the slotted end of the chuckblock, said blades having projections on the edges thereof that seat in the grooves of the drill, and a keeper-sleeve mounted on the chuck-block and adapted to press on the outer edges of the reamer-blades, to center the drill and secure said blades in the head of the chuck-block.

2. In a device of the character described, a cylindrical chuck-block having a threaded axial bore, an oppositely-slotted coniform head, and a thread on its cylindrical body, a peripherally-threaded plug having a kerf in one end and a cavity in the other end, said plug screwing into the bore of the chuckblock, a twist-drill slidable in the bore of the chuck-block and projecting from its coniform head, two similar reamer-blades fitted in the slots in the chuck-block head, said blades I having sloped outer edges terminating at their front ends in beveled countersinking cutting edges,diagonal ribs on the inner edges of the reamer-blades, engaging spiral grooves in the drill, and a keeper-sleeve screwing upon the chuck-block and having a coniform end adapted to bear upon the sloped edges of the rea'mer-blades to press them upon the drill.

3. In a device of the character described, a

peripherally-threaded chuck-block having a forations and fitted in the opposite longitudinal slots in the chuckblock head, said blades having sloped outer edges, concaved inner edges and a diagonal rib in each concave edge for engagement with the grooves in the drill, a bent spring seated in the circumferential groove in the chuck-block head and having hooked ends that engage the perforations in the reamer-blades to hold them in the slots, and a keeper-sleeve having a coniform end, said sleeve being internally threaded and screwing upon the chuckblock to press its coniform end upon the sloped edges of the reamer-blades.

4. Ina device of the character described, a chuck-block having an axial bore and provided with a slotted coniform head, a plug adjustable in the bore, a drill slidable in said IIO' bore and engaged by said p1ug,reamer-b1ades In testimony whereof I have signed my held in the slotted coniform head and each name to this specification in the presence of [0 having a grooved edge to fit upon the body two subscribing Witnesses.

of the drill, and a rib projecting from the grooved edge, the ribs fitting on the grooves JOHN EARL FUHRER' of the drill, and a keeper-sleeve screwing upon Witnesses: the chuck-block and having a coniform end WILLIAM ROBINSON,

for the purpose set forth. BERT L. WEST. 

